Students in central London have protested against higher tuition fees and university budget cuts.
A police van marooned in the protest on Whitehall, was attacked.
There were clashes as police tried to contain surges from demonstrators.
Students are staging occupations, marches, walkouts and protest events at many universities.
School pupils have walked out of lessons in several cities.
It was the second mass protest in the last fortnight against government plans to triple university fees.